var events = require("events");
var Emitter = events.EventEmitter;

function Dog(name, energy){
    Emitter.call(this);
    this.name = name;
    this.energy = energy;
}

Dog.prototype = Emitter.prototype;
Dog.prototype.bark = function(){
    console.log(this.name + " barked！" + "energy：" + this.energy);
}

module.exports = Dog;